Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 La Nucia | 2021/03/09 11:00 | Mario Mansilla Diez v Miguel Damas | 6-3,3-6,3-10 |
| ITF M25 Vic | 2021/05/18 09:35 | Johan Nikles v Miguel Damas | 6-3,7-6 |
| ITF M25 Vic | 2021/05/17 09:00 | Miguel Damas v Martin Damm | 6-3,6-7,10-6 |
| ITF M25 Vic | 2021/05/16 08:00 | Lawrence Bataljin v Miguel Damas | 2-6,3-6 |
| ITF M15 Valldoreix | 2021/05/12 11:30 | Miguel Damas v Oscar Jose Gutierrez | 4-6,6-7 |
| ITF M15 Valldoreix | 2021/05/11 08:00 | Roman Andres Burruchaga v Miguel Damas | 3-6,7-6,9-11 |
| ITF M15 Valldoreix | 2021/05/10 08:00 | Miguel Damas v Benjamin Pietri | 7-5,6-4 |
| ITF M15 Valldoreix | 2021/05/09 13:00 | Miguel Damas v Pablo Alemany | 6-1,3-6,10-8 |
| ITF M15 Majadahonda | 2021/05/03 10:45 | Miguel Damas v Niels Visker | 4-6,3-6 |
| ITF M15 Valldoreix | 2021/05/09 14:00 | Alvaro Lopez San Martin v Mario Mansilla Diez | 6-3,6-0 |
| ITF M15 Majadahonda | 2021/05/03 12:00 | Arthur Fils v Mario Mansilla Diez | 7-6,6-2 |
| ITF M15 Antalya | 2021/04/04 06:30 | Mario Mansilla Diez v Viacheslav Bielinskyi | 6-2,1-6,4-10 |
| ITF M15 Antalya | 2021/03/28 06:30 | Paul Woerner v Mario Mansilla Diez | 2-6,6-2,11-9 |
| ITF M25 La Nucia | 2021/03/14 08:00 | Carlos Lopez Montagud v Mario Mansilla Diez | 6-2,6-4 |
| ITF M15 La Nucia | 2021/03/09 11:00 | Mario Mansilla Diez v Miguel Damas | 6-3,3-6,3-10 |
| ITF M25 Villena | 2021/01/31 10:30 | Denis Klok v Mario Mansilla Diez | 6-2,6-3 |
| ITF M15 Getafe Madrid | 2020/11/29 13:00 | Mario Mansilla Diez v Michael Zhu | 3-6,5-7 |